JP6045181B2 - ゴルフボール用樹脂組成物及びゴルフボール - Google Patents
ゴルフボール用樹脂組成物及びゴルフボール Download PDFInfo
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- JP6045181B2 JP6045181B2 JP2012094886A JP2012094886A JP6045181B2 JP 6045181 B2 JP6045181 B2 JP 6045181B2 JP 2012094886 A JP2012094886 A JP 2012094886A JP 2012094886 A JP2012094886 A JP 2012094886A JP 6045181 B2 JP6045181 B2 JP 6045181B2
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- golf ball
- acid
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
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- C08K5/151—Heterocyclic compounds having oxygen in the ring having one oxygen atom in the ring
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Description
本発明は、少なくとも一層以上のコアと前記コアを被覆するカバーとを有するゴルフボールであって、前記コアの少なくとも一層が前記ゴルフボール用樹脂組成物から形成されているゴルフボールに関する。
本発明はまた、ゴルフボール本体が前記ゴルフボール用樹脂組成物から形成されているワンピースゴルフボールに関する。
前記(a−1)成分は、オレフィンと炭素数3〜8個のα,β−不飽和カルボン酸との二元共重合体であって、共重合体のカルボキシル基が中和されていない非イオン性のものである。前記(a−2)成分は、オレフィンと炭素数3〜8個のα,β−不飽和カルボン酸との二元共重合体の金属イオン中和物であって、共重合体のカルボキシル基の少なくとも一部が金属イオンで中和されたアイオノマー樹脂を挙げることができる。
二元系アイオノマー樹脂の中和度=100×二元系アイオノマー樹脂中の中和されているカルボキシル基のモル数/二元系アイオノマー樹脂中のカルボキシル基の総モル数
三元系アイオノマー樹脂の中和度=100×三元系アイオノマー樹脂中の中和されているカルボキシル基のモル数/三元系アイオノマー樹脂中のカルボキシル基の総モル数
本発明において、非イオン性界面活性剤とは、水中で解離しない水酸基(−OH)、エーテル結合(−O−)などの親水基を持つ界面活性剤であり、例えば、多価アルコール型非イオン性界面活性剤、ポリエチレングリコール型非イオン性界面活性剤、パーフルオロアルキルポリオキシエチレンエーテル、パーフルオロアルケニルポリオキシエチレンエーテルなどが挙げられる。なかでも、反発性、柔軟性及び流動性に優れているという点から、多価アルコール型非イオン性界面活性剤、ポリエチレングリコール型非イオン性界面活性剤が好ましく、多価アルコール型非イオン性界面活性剤が特に好ましい。
総中和度(%)=100×[(A)樹脂成分の陽イオン成分のモル数×陽イオン成分の価数+(C)塩基性無機金属化合物の金属成分のモル数×金属成分の価数]/[(A)樹脂成分のカルボキシル基のモル数]
なお、陽イオン成分、金属成分及びカルボキシル基には、イオン化していない前駆体のモル数を含めるものとする。陽イオン成分量は、例えば、中和滴定により求めてもよい。
下記式を満足することにより、ゴルフボール用樹脂組成物が、高いレベルで軟質を維持しながらも反発性が高くなる。なお、下記式においてlogは常用対数である。
log(E’/E”2)≧−6.55
(1)スラブ硬度(ショアD硬度)
ゴルフボール用樹脂組成物を用いて、熱プレス成形により、厚み約2mmのシートを作製し、23℃で2週間保存した。このシートを、測定基板などの影響が出ないように、3枚以上重ねた状態で、ASTM−D2240に規定するスプリング式硬度計ショアD型を備えた高分子計器社製自動ゴム硬度計P1型を用いて測定した。
MFRは、フローテスター(島津製作所社製、島津フローテスターCFT−100C)を用いて、JIS K7210に準じて測定した。なお、測定は、測定温度190℃、荷重2.16kgの条件で行った。
ゴルフボール用樹脂組成物を用いて、熱プレス成形にて厚み約2mmのシートを作製し、当該シートから直径28mmの円形状に打抜いたものを6枚重ねることにより、厚さ約12mm、直径28mmの円柱状試験片を作製した。この試験片についてリュプケ式反発弾性試験(試験温湿度23℃、50RH%)を行った。なお、試験片の作製及び試験方法は、JIS K6255に準じて行った。
球形体に初期荷重98Nを負荷した状態から終荷重1275Nを負荷したときまでの圧縮方向の変形量(圧縮方向に球形体が縮む量)を測定した。各ボールの圧縮変形は、表1ではボールNo.15の圧縮変形量との比、表2ではボールNo.30の圧縮変形量との比として示した。
各球形体に198.4gの金属製円筒物を40m/秒の速度で衝突させ、衝突前後の円筒物及びゴルフボールの速度を測定し、それぞれの速度及び重量から各ゴルフボールの反発係数を算出した。測定は、各球形体について12個ずつ行って、その平均値を各球形体の反発係数とした。
アマチュアゴルファー(上級者)10人により、ドライバーを用いた実打テストを行って、各人の打撃時のフィーリングを下記基準で評価させた。10人の評価のうち、最も多い評価をそのゴルフボールの打球感とした。
評価基準
優:衝撃が少なくてフィーリングが良い。
良:普通。
不良:衝撃が大きくてフィーリングが悪い。
装置:Bruker Avance 400
測定方法:Torcha法によるT1緩和時間測定
測定周波数:100.6256207MHz
測定温度:室温
基準物質:アダマンタン
マジック角回転の回転数:5000Hz
パルス幅:4.80μsec
コンタクトタイム:2000μsec
パルスの間隔:1μsec,100msec、500msec、1sec、2sec、3sec、4sec、6sec、8sec、10sec、12sec、15sec、20sec、40sec、80sec、120sec
磁場強度:9.4T
ゴルフボール用樹脂組成物の貯蔵弾性率E’(Pa)及び損失弾性率E”(Pa)を以下の条件で測定した。
装置:ユービーエム社製動的粘弾性測定装置Rheogel−E4000
測定サンプル:ゴルフボール用樹脂組成物から、プレス成形により厚み2mmのシートを作製し、このシートから、幅4mm、クランプ間距離20mmになるように試料片を切り出した。
測定モード:引張
測定温度:12℃
加振周波数:10Hz
測定ひずみ:0.05%
表1〜2に示すように、配合材料をドライブレンドし、二軸混練型押出機によりミキシングして、ストランド状に冷水中に押し出した。押出されたストランドをペレタイザーにより切断してペレット状のゴルフボール用樹脂組成物を調製した。押出条件は、スクリュー径45mm、スクリュー回転数200rpm、スクリューL/D=35であり、配合物は、押出機のダイの位置で160〜230℃に加熱された。得られたペレット状のゴルフボール用樹脂組成物を220℃にて射出成形し、直径40mmの球形体(コア)を得た。
ニュクレルAN4319:三井・デュポンポリケミカル社製、エチレン・メタクリル酸・アクリル酸ブチル共重合体(メルトフローレイト(190℃×2.16kg):55g/10min、曲げ剛性率:21MPa、メタクリル酸含量:8質量%)
ニュクレルN1560:三井・デュポンポリケミカル社製、エチレン・メタクリル酸共重合体(メルトフローレイト(190℃×2.16kg):60g/10min、曲げ剛性率:83MPa、メタクリル酸含量15質量%)
水酸化マグネシウム:和光純薬工業社製
グリセリンモノオレエート(オレイン酸モノグリセリド):理研ビタミン(株)社製「リケマール OL−100E」
グリセリンモノステアレート(ステアリン酸モノグリセリド):理研ビタミン(株)社製「リケマール S−100」
ソルビタンモノオレエート:理研ビタミン(株)社製「ポエム O−80V」
ソルビタントリオレエート:理研ビタミン(株)社製「リケマール OR−85」
Claims (7)
- (A)(a−1)オレフィンと炭素数3〜8個のα,β−不飽和カルボン酸との二元共重合体、(a−2)オレフィンと炭素数3〜8個のα,β−不飽和カルボン酸との二元共重合体の金属イオン中和物、(a−3)オレフィンと炭素数3〜8個のα,β−不飽和カルボン酸とα,β−不飽和カルボン酸エステルとの三元共重合体、及び、(a−4)オレフィンと炭素数3〜8個のα,β−不飽和カルボン酸とα,β−不飽和カルボン酸エステルとの三元共重合体の金属イオン中和物からなる群より選択される少なくとも1種を含む樹脂成分と、
(B)非イオン性界面活性剤とを含有し、
前記非イオン性界面活性剤は、グリセリンと炭素数8〜30の不飽和脂肪酸とを反応させて得られる脂肪酸エステルであり、
前記(A)樹脂成分100質量部に対して、前記(B)非イオン性界面活性剤を70〜100質量部含有するゴルフボール用樹脂組成物。 - 前記不飽和脂肪酸は、オレイン酸、リノール酸、リノレン酸、エライジン酸、ステアロル酸、リシノール酸、リシネライジン酸及びこれらの分岐脂肪酸からなる群より選択される少なくとも1種である請求項1記載のゴルフボール用樹脂組成物。
- 前記非イオン性界面活性剤は、グリセリンモノオレエート及びグリセリンジオレエートからなる群より選択される少なくとも1種である請求項1又は2記載のゴルフボール用樹脂組成物。
- 前記(A)樹脂成分100質量部に対して、(C)塩基性無機金属化合物を100質量部以下含有する請求項1〜3のいずれかに記載のゴルフボール用樹脂組成物。
- 請求項1〜4のいずれかに記載のゴルフボール用樹脂組成物から形成された構成部材を有するゴルフボール。
- 少なくとも一層以上のコアと前記コアを被覆するカバーとを有するゴルフボールであって、前記コアの少なくとも一層が請求項1〜4のいずれかに記載のゴルフボール用樹脂組成物から形成されているゴルフボール。
- ゴルフボール本体が請求項1〜4のいずれかに記載のゴルフボール用樹脂組成物から形成されているワンピースゴルフボール。
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US13/686,191 US20130137534A1 (en) | 2011-11-29 | 2012-11-27 | Resin composition for golf ball and golf ball |
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JP5238486B2 (ja) * | 2008-12-26 | 2013-07-17 | ダンロップスポーツ株式会社 | ゴルフボール |
US8058331B2 (en) * | 2009-03-20 | 2011-11-15 | Acushnet Company | Golf balls containing highly neutralized acid polymers and sugar ester HLB modifiers |
JP5478361B2 (ja) * | 2010-05-21 | 2014-04-23 | 三井・デュポンポリケミカル株式会社 | アイオノマー組成物 |
JP6087636B2 (ja) * | 2012-07-30 | 2017-03-01 | ダンロップスポーツ株式会社 | ゴルフボール用樹脂組成物及びゴルフボール |
-
2012
- 2012-04-18 JP JP2012094886A patent/JP6045181B2/ja not_active Expired - Fee Related
- 2012-11-27 US US13/686,191 patent/US20130137534A1/en not_active Abandoned
- 2012-11-28 CN CN2012104972179A patent/CN103131074A/zh active Pending
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JP2013136717A (ja) | 2013-07-11 |
CN103131074A (zh) | 2013-06-05 |
US20130137534A1 (en) | 2013-05-30 |
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